Super resolution OLED array for next generation user interface

Introduction

OLEDs – organic light-emitting diodes – are becoming the dominant technology for mobile displays, as they are bright, color-pure, and allow curved "infinity" displays that bend around the edge. In today's displays, about 500ppi is possible with OLED technology. To further scale OLED displays to higher resolution towards several thousands of ppi, as required for Virtual Reality and Augmented Reality, new processes are being explored for scaling down OLED pixels. For example, some groups work on printed OLEDs, others pattern OLEDs by photolithography and etch. However, these processes have an impact on OLED lifetime. Therefore, fundamentals of OLED degradation have to be reconsidered in the light of these processes.

Topic

The purpose of this PhD is to research fundamental processes of degradation of organic semiconductors integrated in OLED devices as induced the process technologies that are considered for super-resolution VR and AR OLED displays. OLED pixels of 2 to 5 microns are considered. The killer impurities will be identified, and strategies will be invented to avoid them. The study will result in processes for target 5000 ppi OLEDs. The systematic investigation will consist of fabricating reference OLEDs by vacuum evaporation, exposing them to a series of controlled environments of chemicals, and perform analysis to map relationships and bring understanding of the phenomena. Specifically, chemical as well as opto-electronic analysis is foreseen, supported by modelling. Several types of OLEDs can be compared: phosphorescent, fluorescent, TADF and hyper-fluorescent.

The candidate

You are a highly motivated recent graduate holding a master's degree in chemistry, material science, nano-engineering, or related. You have a interest in OLED devices, and like a multi-disciplinary subject in which you will relate understanding of processes and chemicals to optical and electrical degradation at device level. You will be expected to work safely in a cleanroom environment and acquire processing and lab skills. It is expected that you will present results regularly. You are a team player and have good communication skills as you will work in a multidisciplinary and multicultural team spanning several imec departments. Given the international character of imec, an excellent knowledge of English is a must.​

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